Update 92-reverse-linked-list-ii.js

Author: everthis

92-reverse-linked-list-ii.js

@@ -159,3 +159,38 @@ const reverseBetween = function(head, left, right) {
 
   return prev ? head : r
 };
+
+// another
+
+/**
+ * Definition for singly-linked list.
+ * function ListNode(val, next) {
+ *     this.val = (val===undefined ? 0 : val)
+ *     this.next = (next===undefined ? null : next)
+ * }
+ */
+/**
+ * @param {ListNode} head
+ * @param {number} left
+ * @param {number} right
+ * @return {ListNode}
+ */
+const reverseBetween = function(head, left, right) {
+  if(head == null) return head
+  const dummy = new ListNode()
+  dummy.next = head
+
+  let p = dummy
+  for(let i = 0; i < left - 1; i++) {
+    p = p.next
+  }
+  let tail = p.next, tmp = null
+  for(let i = 0; i < right - left; i++) {
+    tmp = p.next
+    p.next = tail.next
+    tail.next = tail.next.next
+    p.next.next = tmp
+  }
+  
+  return dummy.next
+};